EDI 855 Outbound - Output Requirement

Hi EDI Experts,
I have a requirement. I want to send my outbound 855 IDocs out of SAP. But there is some twist here. I cannot send my Outbound IDocs as soon as the Sales order is created. Once the sales order is created, at a later point of time an acknowledgement code will be added to the sales order by CR. Only then I am supposed to send the IDocs out of SAP. (Infact IDocs should be created at that point of time). Any idea/suggestion how this can be achieved. Ur comments are most valuable and welcome.
Thanks,
Matt

Neal is right about where the question should be asked, although the answer
to this one does involve a little ABAP code, in an output requirement, which
checks conditions implemented thru a special ABAP routine before generating
an IDoc when a sales document is created. Requirements can be identified
along with output types and supporting configuration in transaction NACE.

You can consult the SAP help system for more details. I cover this topic in
some detail in my new book "Architecting EDI with SAP IDocs" from SAP Press.
Thanks and regards, ejh.